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Message: <blockquote data-quote="brightwhite98GT" data-source="post: 659541" data-attributes="member: 10012">I recently got a 1994 5.0 liter. I ran the diagnostic test today and its telling me that I am running lean at full throttle but rich at idle. Its also telling me I have insufficient throttle position change during throttle response test. It says my throttle position sensor is below min. voltage, and it did not run the O2 test because my RPM's are too low. Why would I be lean at full throttle but rich at idle? Is my TPS adjustable or do I need to buy a new one? Could any other underlieing problems be because of the O2 test?mods include EGR delete, AC/SMOG delete, shorty headers, MSD cap, MSD ignition, cold air intake, and the exhaust is temporarily dumped after the H pipe. Thanks !!</blockquote>